Part 1 The function f(x)=60e^-0.8x+40 describes the percentage of​ information, f(x), that a particular person remembers

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Part 1
The function
f(x)=60e^-0.8x+40
describes the percentage of​ information, f(x), that aparticular person remembers x weeks after learning theinformation.
a.
Substitute 0 for x​ and, without using a​ calculator,find the percentage of information remembered at the moment it isfirst learned.
b.
Substitute 1 for x and find the percentage of information thatis remembered after 1 week.
c.
4
d.
Find the percentage of information that is remembered after oneyear​ (52 weeks)